Orthophotography layer for Sonoma County

The Grades 2012 layer was derived from LiDAR collected in spring of 2012 by Merrick & Co. in coordination with Tallahassee - Leon County GIS. This layer depicts Significant Grades (10-20% Slope) and Severe Grades (greater than 20% Slope). It is intended to provide City of Tallahassee & Leon County departments with slope grade data for planning related purposes. The layer is meant to be used as a guide and not to take the place of a land survey by a licensed surveyor. This layer is used as an indicator for environmental regulation of development by the City of Tallahassee Growth Management and Leon County Development Services and Environmental Management Departments.

HydrologyThis feature layer describes and displays the various types of water features (lines) within Stafford County, Virginia.Table Glossary:The "TYPE" variable describes the different kinds of water features within Stafford County:1 - Lakes, Reservoirs, Ponds2 - Storm Ponds (Dry)3 - Perennial Streams (Double line > 10' wide)4 - Islands5 - Shorelines (Potomac and Rappahannock Rivers only)6 - Large Dams7 - Swamp / Marshes8 - Tidal Marsh9 - Intermittent Streams (Single line <10' wide)10 - Perennial Streams (Single line <10' wide)11 - Open Ditch (Single line)12 - Small Dam (Single line)13 -Hydrography Connector (Line connecting visible hydrography for connectivity)99 - Out AreaCreated by the Stafford County GIS OfficeData was taken from Merrick & Company (2000-2001).

This dataset has been deprecated. Please use our 2017 Digital Elevation Models instead.The Digital Surface Model (DSM) is a 3-foot pixel resolution raster in GeoTIFF format. This was created using all points (excluding NOISE) from our 2007 LiDAR data without incorporating the breaklines. Merrick and Co. MARS (ver. 8.0.4, build 8185) software was used to create the GeoTIFF images.The DSMs were developed using LiDAR data. LiDAR is an acronym for LIght Detection And Ranging. Light detection and ranging is the science of using a laser to measure distances to specific points. A specially equipped airplane with positioning tools and LiDAR technology was used to measure the distance to the surface of the earth. The classified points were developed using data collected in April to May 2007. The LiDAR points, specialized software, and technology provide the ability to create a high precision three-dimensional digital elevation and/or terrain models (DEM/DTM) as well as digital surface models (DSM). The use of LiDAR significantly reduces the cost for developing this information.The DSMs are intended to correspond to the orthometric heights of the surface of the county including above ground features such as buildings, vegetation cover, utility structures, vehicles ... etc. DSM data are used by county agencies and others to study drainage issues such as flooding and erosion; contour generation; slope and aspect; and hill shade images. Elevation data and models are used in several different ways including:Visualization representations of the elevation data. Examples include:- A hillshaded or shaded relief image- An image representing slope- An image representing aspectAnalysis of the elevation data and analytical products which can be generated. Examples include:- Viewshed calculations for visibility and line-of-sight analysis- Areas of highest Solar energy potential- Uses in disaster management- Industrial planning- Calculation of cartographic contours- Calculation of profiles along straight lines or line segmentsThese data are derived from other data sources, no accuracy measurements or tests were conducted. Primary use and intent for these data are for visualizations and topographic analysis. This dataset does not take the place of an on-site survey for design, construction or regulatory purposes.

Intended as a repository for all publicly owned land in Sonoma County, this would include but is not limited to county, state, local, and federal property which may or may not include parks, landfills, corporate yards, business and services, hospital property. This layer is not intended to make any determination regarding public access. This layer was compiled from two primary sources; the County seamless parcel base and the Merrick 2000 orthophotography. This layer was originally created to support the 1989 version of the Open Space Element of the General Plan.

This dataset has been deprecated. Please use our 2017 Digital Elevation Models instead.The Digital Surface Model (DSM) is a 3-foot pixel resolution raster in GeoTIFF format. This was created using all points (excluding NOISE) from our 2007 LiDAR data without incorporating the breaklines. Merrick and Co. MARS (ver. 8.0.4, build 8185) software was used to create the GeoTIFF images.The DSMs were developed using LiDAR data. LiDAR is an acronym for LIght Detection And Ranging. Light detection and ranging is the science of using a laser to measure distances to specific points. A specially equipped airplane with positioning tools and LiDAR technology was used to measure the distance to the surface of the earth. The classified points were developed using data collected in April to May 2007. The LiDAR points, specialized software, and technology provide the ability to create a high precision three-dimensional digital elevation and/or terrain models (DEM/DTM) as well as digital surface models (DSM). The use of LiDAR significantly reduces the cost for developing this information.The DSMs are intended to correspond to the orthometric heights of the surface of the county including above ground features such as buildings, vegetation cover, utility structures, vehicles ... etc. DSM data are used by county agencies and others to study drainage issues such as flooding and erosion; contour generation; slope and aspect; and hill shade images. Elevation data and models are used in several different ways including:Visualization representations of the elevation data. Examples include:- A hillshaded or shaded relief image- An image representing slope- An image representing aspectAnalysis of the elevation data and analytical products which can be generated. Examples include:- Viewshed calculations for visibility and line-of-sight analysis- Areas of highest Solar energy potential- Uses in disaster management- Industrial planning- Calculation of cartographic contours- Calculation of profiles along straight lines or line segmentsThese data are derived from other data sources, no accuracy measurements or tests were conducted. Primary use and intent for these data are for visualizations and topographic analysis. This dataset does not take the place of an on-site survey for design, construction or regulatory purposes.

hydropolyThis feature layer describes and displays the various types of water features (polygons) within Stafford County, Virginia.Table Glossary:The "TYPE" variable describes the different kinds of water features within Stafford County:1 - Lakes, Reservoirs, Ponds2 - Storm Ponds (Dry)3 - Perennial Streams (Double line > 10' wide)4 - Islands5 - Shorelines (Potomac and Rappahannock Rivers only)6 - Large Dams7 - Swamp / Marshes8 - Tidal Marsh99 - Out AreaCreated by the Stafford County GIS OfficeData was taken from Merrick & Company (2000-2001).

Map Tiles is a reference dataset used to identify the spatial location of DWG contour data delivered to TLCGIS by Merrick. The attributes contained in the PAGE field in Map Tiles can be used to reference the name of the the individual DWG contour files.The individual DWG contour files are bundled into 4 quadrants for Leon County: NE, NW, SE, & SW. You may download these quadrants to use in conjuction with the Map Tiles data.

2008 Cook County 1 ft. elevation contours for PLSS Township Area 09. Data is derived from 2008 lidar. If you plan on downloading this dataset it is recommended to use the File Geodatabase option. The shapefile format may not work for larger datasets.This layer contains polyline geometry displaying 1-foot contours for Cook County, Illinois. The 1-foot contours were interpolated from a Digital Terrain Model (DTM) that was created during 2009, for the Cook County Board of Commissioners, by the engineering firm, Merrick & Company (Merrick). (See "Cross Reference" in the Identification Information section of this metadata report for full citation information.) The 1-foot contours cover the extent of the Cook County corporate limits, plus a buffer of an additional three hundred feet (300'). The 1-foot contours described in this feature class reflect ground conditions on specific dates during 2008 and 2009. Those dates, which are associated with a data collection mission using a Light Detection and Ranging (LiDAR) system, are as follows: November 21-23, 25, 26, 28, 29, 2008; April 11-14 2009. This dataset meets National Map Accuracy Standards (NMAS) for 1:1,200 (1"=100') scale mapping and 1' contours. This dataset is projected using the Transverse Mercator map projection. The grid coordinate system used is the Illinois State Plane Coordinate System, East Zone (Zone Number Zone 3776, FIPS 1201), NAD83/97 HARN (horizontal datum), NAVD88 (vertical datum), with ground coordinates expressed in U.S. Survey Feet.